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#!/bin/sh
set -e
kill_child_jobs() {
# From https://stackoverflow.com/a/23336595
# Kills all child processes, not just jobs.
pkill -P $$
}
cleanup() {
kill_child_jobs
}
# From https://unix.stackexchange.com/a/240736
for sig in INT QUIT HUP TERM; do
trap "
cleanup
trap - $sig EXIT
kill -s $sig "'"$$"' "$sig"
done
trap cleanup EXIT
verbose=y
cpulimit_args="--lazy"
limit=""
pids=""
exes=""
paths=""
max_processes=100
max_depth=3
watch_interval=0
subprocess_watch_interval=0.5
while [ $# -gt 0 ]
do
opt="$1"
case "$opt" in
*=*)
arg="${1#*=}"
opt="${1%%=*}"
argshift=1
;;
*)
if [ "$#" -ge 2 ]
then
arg="$2"
else
arg=""
fi
argshift=2
;;
esac
case "$opt" in
-h|--help)
cat <<EOF
Usage: $0 [TARGET] [OPTIONS...] [-- PROGRAM]
TARGET may be one or more of these (either TARGET or PROGRAM is required):
-p, --pid=N pid of a process
-e, --exe=FILE name of a executable program file
-P, --path=PATH absolute path name of a
executable program file
OPTIONS for $0
--max-depth=N If 0, only target explicitly referenced processes.
Otherwise, target subprocesses up to N layers deep.
--max-processes=N
Maximum number of processes to limit. After this
limit is reached, new processes will be limited
as old ones die.
--watch-interval=INTERVAL
If 0 (default), targets will be selected at
setup. Otherwise, every INTERVAL (argument to
sleep(1)), search for more possible targets.
--subprocess-watch-interval=INTERVAL
During setup, delay INTERVAL (argument to sleep(1))
between searches for more subprocesses to avoid
spending 100% CPU searching for targets.
-- This is the final $0 option. All following
options are for another program we will launch.
-h, --help display this help and exit
OPTIONS forwarded to CPUlimit
-c, --cpu=N override the detection of CPUs on the machine.
-l, --limit=N percentage of cpu allowed from 1 up.
Usually 1 - 800, but can be higher
on multi-core CPUs (mandatory)
-q, --quiet run in quiet mode (only print errors).
(Also suppresses messages from $0.)
-k, --kill kill processes going over their limit
instead of just throttling them.
-r, --restore Restore processes after they have
been killed. Works with the -k flag.
-s, --signal=SIG Send this signal to the watched process when cpulimit exits.
Signal should be specificed as a number or
SIGTERM, SIGCONT, SIGSTOP, etc. SIGCONT is the default.
-v, --verbose show control statistics
EOF
exit 1
;;
--max-depth)
case $arg in
''|*[!0-9]*)
echo "Invalid max depth: $arg, must be a non-negative integer."
exit 5
;;
*)
max_depth=$arg
shift $argshift
;;
esac
;;
--max-processes)
case $arg in
''|*[!0-9]*)
echo "Invalid max processes: $arg, must be a positive integer."
exit 5
;;
*)
max_processes=$arg
shift $argshift
;;
esac
;;
--watch-interval)
watch_interval="$arg"
shift $argshift
;;
--subprocess-watch-interval)
subprocess_watch_interval="$arg"
shift $argshift
;;
-p|--pid)
if [ -z "$pids" ]
then
pids="$arg"
else
pids="$pids
$arg"
fi
shift $argshift
;;
-e|--exe)
if [ -z "$exes" ]
then
exes="$arg"
else
exes="$exes
$arg"
fi
shift $argshift
;;
-P|--path)
if [ -z "$paths" ]
then
paths="$arg"
else
paths="$paths
$arg"
fi
shift $argshift
;;
-l|--limit)
limit="$arg"
cpulimit_args="$cpulimit_args --limit=$arg"
shift $argshift
;;
-c|--cpu)
cpulimit_args="$cpulimit_args --cpu=$arg"
shift $argshift
;;
-v|--verbose)
cpulimit_args="$cpulimit_args --verbose"
shift
;;
-q|--quiet)
verbose=""
cpulimit_args="$cpulimit_args --quiet"
shift
;;
-k|--kill)
cpulimit_args="$cpulimit_args --kill"
shift
;;
-r|--restore)
cpulimit_args="$cpulimit_args --restore"
shift
;;
-s|--signal)
cpulimit_args="$cpulimit_args --signal=$arg"
shift $argshift
;;
--)
shift
break
;;
*)
echo "Unexpected argument: \"$1\""
exit 3
;;
esac
done
if [ -z "$limit" ]
then
echo "Must specify a CPU percentage to limit to (-l/--limit)."
exit 4
fi
if [ -z "$pids" ] && [ -z "$exes" ] && [ -z "$paths" ] && [ "$#" -eq 0 ]
then
echo "Must specify at least one PID, executable file, path, or command line to limit."
exit 5
fi
watched_pids=""
limit_pid() {
if echo "$watched_pids" | grep --silent -F "$1"
then
return
fi
if [ "$(echo "$watched_pids" | wc -l)" -ge "$max_processes" ]
then
return
fi
if [ -n "$verbose" ]
then
if [ -n "$3" ]
then
echo "Limiting $3: "
fi
echo "cpulimit --pid=$1 $cpulimit_args"
fi
# shellcheck disable=SC2086 # $cpulimit_args really is the intended args.
cpulimit --pid="$1" $cpulimit_args &
cpulimit_pid=$!
new_watched="$1:$2:$cpulimit_pid:$3"
if [ -z "$watched_pids" ]
then
watched_pids="$new_watched"
else
watched_pids="$watched_pids
$new_watched"
fi
}
limit_pids() {
pids="$1"
depth="$2"
while read -r pid
do
# From https://stackoverflow.com/a/3951175
case $pid in
''|*[!0-9]*)
# PID is not a number
;;
*)
limit_pid "$pid" "$depth" "$3"
;;
esac
done <<EOF
$pids
EOF
}
limit_by_executable() {
if [ -n "$exes" ]
then
while read -r exe
do
limit_pids "$(pgrep -x "$exe")" 0 "$exe"
done <<EOF
$exes
EOF
fi
if [ -n "$paths" ]
then
while read -r path
do
limit_pids "$(pgrep -xf "$path")" 0 "$path"
done <<EOF
$paths
EOF
fi
}
limit_by_subprocess() {
if [ -z "$watched_pids" ] || [ "$max_depth" -eq 0 ]
then
return
fi
while read -r watched
do
depth="$(echo "$watched" | cut -d: -f2)"
if [ "$max_depth" -gt "$depth" ]
then
# Make sure the parent is still alive.
if ps -p "$(echo "$watched" | cut -d: -f3)" >/dev/null
then
ppid="$(echo "$watched" | cut -d: -f1)"
original="$(echo "$watched" | cut -d: -f4-)"
limit_pids "$(pgrep -P "$ppid")" "$((depth + 1))" "child of $ppid ($original)"
fi
fi
done <<EOF
$watched_pids
EOF
}
clean_dead_cpulimit() {
if [ -z "$watched_pids" ]
then
return
fi
tmp="$(echo "$watched_pids" | while read -r watched
do
if ps -p "$(echo "$watched" | cut -d: -f3)" >/dev/null
then
echo "$watched"
fi
done)"
watched_pids="$tmp"
}
if [ "$#" -gt 0 ]
then
"$@" &
limit_pid "$!" 0 "program run on command line: $*"
fi
limit_pids "$pids" 0
while true
do
clean_dead_cpulimit
if [ -z "$exes" ] && [ -z "$paths" ] && [ -z "$watched_pids" ]
then
# If there's nothing left to wait for, then exit.
exit
fi
limit_by_executable
if [ -z "$watched_pids" ]
then
num_watched_before=0
else
num_watched_before="$(echo "$watched_pids" | wc -l)"
fi
limit_by_subprocess
if [ -z "$watched_pids" ]
then
num_watched_after=0
else
num_watched_after="$(echo "$watched_pids" | wc -l)"
fi
if [ "$num_watched_before" -eq "$num_watched_after" ]
then
if [ "$watch_interval" = "0" ]
then
if [ "$num_watched_after" -eq 0 ]
then
if [ -n "$verbose" ]
then
echo "No processes found, exiting. Specify --watch-interval to continue scanning for processes."
fi
exit
else
if [ -n "$verbose" ]
then
echo "Identified all processes to limit, waiting."
fi
wait
fi
else
sleep "$watch_interval"
fi
else
sleep "$subprocess_watch_interval"
fi
done